-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-int vsnprintf( char * restrict s, size_t n, const char * restrict format, va_list ap ) { /* TODO */ };
+/* $Id$ */
+
+/* vsnprintf( char *, size_t, const char *, va_list ap )
+
+ This file is part of the Public Domain C Library (PDCLib).
+ Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#ifndef REGTEST
+#include <_PDCLIB_io.h>
+
+int vsnprintf( char * _PDCLIB_restrict s,
+ size_t n,
+ const char * _PDCLIB_restrict format,
+ _PDCLIB_va_list arg )
+{
+ /* TODO: This function should interpret format as multibyte characters. */
+ struct _PDCLIB_status_t status;
+ status.base = 0;
+ status.flags = 0;
+ status.n = n;
+ status.i = 0;
+ status.current = 0;
+ status.s = s;
+ status.width = 0;
+ status.prec = 0;
+ status.stream = NULL;
+ va_copy( status.arg, arg );
+
+ while ( *format != '\0' )
+ {
+ const char * rc;
+ if ( ( *format != '%' ) || ( ( rc = _PDCLIB_print( format, &status ) ) == format ) )
+ {
+ /* No conversion specifier, print verbatim */
+ if ( status.i < n )
+ {
+ s[ status.i ] = *format;
+ }
+ status.i++;
+ format++;
+ }
+ else
+ {
+ /* Continue parsing after conversion specifier */
+ format = rc;
+ }
+ }
+ if ( status.i < n )
+ {
+ s[ status.i ] = '\0';
+ }
+ va_end( status.arg );
+ return status.i;
+}
+
+#endif
+
+#ifdef TEST
+#define _PDCLIB_FILEID "stdio/vsnprintf.c"
+#define _PDCLIB_STRINGIO
+
+#include <_PDCLIB_test.h>
+
+static int testprintf( char * s, const char * format, ... )
+{
+ int i;
+ va_list arg;
+ va_start( arg, format );
+ i = vsnprintf( s, 100, format, arg );
+ va_end( arg );
+ return i;
+}
+
+int main( void )
+{
+ char target[100];
+#include "printf_testcases.h"
+ return TEST_RESULTS;
+}
+
+#endif
+